Real-time modeling of variable bus load structure based on wind power permeability

摘要

This paper focuses on the influence of wind power permeability on the accuracy of bus load model and the real-time modeling of variable bus load structure. Firstly, a generalized comprehensive load model including doubly-fed wind turbine (DFIG) is established under the daily load curve of the bus with wind power connected to the substation, and the small disturbance parameter identification method is used to identify the parameters of the model; Based on the model accuracy evaluation method based on the similarity of values and trends, the results are evaluated, the wind power permeability is introduced, and the relationship between the wind power permeability and the model accuracy is described; the wind power permeability value at the point where the accuracy of the model drops sharply. As a demarcation point, two load models under different wind power penetration rates are established. One is the generalized load model that takes into account the connection of wind turbines, and the other is the traditional load model that ignores the connection of wind turbines; Continuous parameter identification of the variable structure load model under the same daily load curve again; simulation results show that the relationship between wind power permeability and model accuracy is generally inversely proportional, and the traditional load model can still describe the bus well even when the wind power permeability is low Load characteristics.